based on the simple model with interference. Actually, based on various
theoretical models, a lot of research has been conducted on fully-heavy
tetraquark states [1]}, [2]}, [3]}, [4]}, [5]}, [6]}, [7]}, [8]}, [9]}, [10]}, [11]}, [12]}, [13]}, [14]}, [15]}, [16]}, [17]}, [18]}, [19]}, [20]}, [21]}, [22]}, [23]}, [24]}, [25]}, [26]}, [27]}, [28]}, which are important to reveal the structure and properties of the
fully-heavy tetraquark state. For example, the \(X(6900)\)  was interpreted as
a \(P-\) wave tetraquark state in a nonrelativistic quark model [23]}, or the first radial excitation of \(cc\bar{c}\bar{c}\)  in an
extended relativized quark model [24]}. In the QCD sum rule
framework, the narrow structure \(X(6900)\)  can be interpreted as a second
radial excited \(S-\) wave tetraquark state [25]} or a \(P-\) wave
state [26]} with \(J^{PC}=0^{-+},1^{-+}\) , respectively. In
refs. [27]}, [28]}, the theoretical results indicate that
there may exist the resonance states, with masses range between 6.3 GeV to
7.4 GeV, and the quantum numbers \(J^{P}=0^{+},1^{+}\)  and \(2^{+}\) .
In ref. [35]}, the spin parity of the state formed by the two-vector system was discussed,
and a possible method for determining its quantum number was given.
